| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 407386 |
2021-05-18T20:45:32 Z |
peuch |
Simurgh (IOI17_simurgh) |
C++17 |
|
2 ms |
460 KB |
#include "simurgh.h"
#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1010;
int n, m;
vector<int> u, v;
vector<int> ar[MAXN], id[MAXN];
int marc[MAXN];
int grp[MAXN * MAXN];
int rep[MAXN], tam[MAXN];
vector<int> getPath(int cur, int fim, int x);
vector<int> getST(vector<int> base);
bool uni(int a, int b);
int find(int a);
vector<int> find_roads(int _n, vector<int> _u, vector<int> _v) {
n = _n;
u = _u, v = _v;
m = u.size();
for(int i = 0; i < u.size(); i++){
ar[u[i]].push_back(v[i]);
id[u[i]].push_back(i);
ar[v[i]].push_back(u[i]);
id[v[i]].push_back(i);
}
for(int i = 0; i < u.size(); i++){
if(grp[i] != 0) continue;
// printf("Calculating: %d\n", i);
for(int j = 0; j < n; j++) marc[j] = 0;
vector<int> path = getPath(u[i], v[i], i);
if(path.empty()) {
// printf("\tBridge\n");
grp[i] = 1;
continue;
}
// printf("\tCycle: %d ", i);
// for(int j = 0; j < path.size(); j++)
// printf("%d ", path[j]);
// printf("\n");
vector<int> cnt(path.size(), 0);
vector<int> r = getST(path);
path.push_back(i);
int maxi = 0;
for(int j = 0; j < path.size(); j++){
if(grp[path[j]] != 0) continue;
vector<int> test = r;
for(int k = 0; k < path.size(); k++)
if(k != j) test.push_back(path[k]);
cnt[j] = count_common_roads(test);
maxi = max(maxi, cnt[j]);
// printf("Tested: %d -> %d\n", path[j], cnt[j]);
}
for(int j = 0; j < path.size(); j++){
if(grp[path[j]] != 0) continue;
if(cnt[j] == maxi) grp[path[j]] = -1;
if(cnt[j] != maxi) grp[path[j]] = 1;
}
}
vector<int> ans;
for(int i = 0; i < m; i++)
if(grp[i] == 1) ans.push_back(i);
// for(int i = 0; i < ans.size(); i++){
// printf("%d ", ans[i]);
// }
// printf("\n");
return ans;
}
vector<int> getPath(int cur, int fim, int x){
marc[cur] = 1;
vector<int> ret;
for(int i = 0; i < ar[cur].size(); i++){
int viz = ar[cur][i];
if(marc[viz]) continue;
if(id[cur][i] == x) continue;
ret = getPath(viz, fim, x);
if(ret.empty() && viz != fim) continue;
ret.push_back(id[cur][i]);
return ret;
}
return ret;
}
vector<int> getST(vector<int> base){
vector<int> ret;
for(int i = 0; i < n; i++){
tam[i] = 1;
rep[i] = i;
}
for(int i = 0; i < base.size(); i++)
uni(u[base[i]], v[base[i]]);
for(int i = 0; i < m; i++)
if(uni(u[i], v[i])) ret.push_back(i);
return ret;
}
bool uni(int a, int b){
a = find(a);
b = find(b);
if(a == b) return 0;
if(tam[a] < tam[b]) swap(a, b);
tam[a] += tam[b];
rep[b] = a;
return 1;
}
int find(int a){
if(a == rep[a]) return a;
return rep[a] = find(rep[a]);
}
Compilation message
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:25:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
25 | for(int i = 0; i < u.size(); i++){
| ~~^~~~~~~~~~
simurgh.cpp:32:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
32 | for(int i = 0; i < u.size(); i++){
| ~~^~~~~~~~~~
simurgh.cpp:56:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
56 | for(int j = 0; j < path.size(); j++){
| ~~^~~~~~~~~~~~~
simurgh.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
60 | for(int k = 0; k < path.size(); k++)
| ~~^~~~~~~~~~~~~
simurgh.cpp:68:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
68 | for(int j = 0; j < path.size(); j++){
| ~~^~~~~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> getPath(int, int, int)':
simurgh.cpp:89:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
89 | for(int i = 0; i < ar[cur].size(); i++){
| ~~^~~~~~~~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> getST(std::vector<int>)':
simurgh.cpp:107:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
107 | for(int i = 0; i < base.size(); i++)
| ~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
460 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
460 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
460 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
correct |
| 2 |
Runtime error |
2 ms |
460 KB |
Execution killed with signal 6 |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
460 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
